Check out the following, which work fine on Juno:
- checkstyle: code style, including method length and others
- checkstyle again: duplicate code detection
- checkstyle again: Cyclomatic Complexity
- cobertura: for test coverage
- findbugs: potential pitfalls in your code
- Google Plugin for eclipse google's own code quality tools including test generation
I suppose you are not looking for profilers, but if you are, consider the (newly resurrected?) TPTP